Who picked ages 18-34 to study people not buying insurance? What about older healthy people?

The entire premise of Obamacare is that the 18-34 cohort -- which is the least likely to buy health insurance -- would end up paying for either a.) the low income premium subsidies with their tax penalties or b.) the discounted premiums for older healthy people.

Somebody has to pay the freight...and it was 18-34's who were nominated.

Consequently, if they don't cooperate, the scheme collapses into a pile of excrement.